/var/log/kern.log:May 25 10:51:39 d3 kernel: [8034006.936174] php-fpm56[17471]: segfault at 7fff28e2ed88 ip 00007fbd82b8f2c4 sp 00007fff28e2ed90 error 6 in libmemcached.so.10.0.0[7fbd82b6c000+34000]

/var/log/kern.log:May 26 09:50:40 d3 kernel: [8116748.345766] php-fpm56[22969]: segfault at 7fffa0be4e28 ip 00007f9db3c0d2c4 sp 00007fffa0be4e30 error 6 in libmemcached.so.10.0.0[7f9db3bea000+34000]

error about 502:2015/05/28 22:13:38 [error] 16168#0: *5231 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 90.156.66.15, server: xxxxxxxx.com, request: "GET /facebook-connect/login?backUri=index HTTP/1.1", upstream: "fastcgi://unix:/usr/local/php56/sockets/xxxxxxx.sock:", host: "www.xxxxxxxxxxx.com", referrer: "https://www.xxxxxxxxx.com/index"